Telegraph apparatus



Sept. 12, 1944. F. J. WHITE ETAL TELEGRAPH APPARATUS Filed 001:. l, 1940 1 4 Sheets-Sheet l u I u al/Jul E 2 FIG. 2

ORN

F. J. WHITE EI'AL TELEGRAPH APPARATUS Filed Oct. 1. 1940 Sept. 12, 1944.

4 Sheets-Sheet 2 FIG.4

Sept, 12, 1944.

F. J. WHITE 517m.

TELEGRAPH APPARATUS Filed 001;. 1, 1940 4 sheet-sheet 5 FIG. 5'

PIC-3.6

P 9 F. J. WHITE AL TELEGRAPH APPARATUS Filed 001;. l, 1940 4 Sheets-Sheet 4 FIG. 8

STATION STATION STATION MONITOR RECEIVER 83 TRANSMITTER Patented Sept. 12, 1944 UNITED STATES PATENT ICE r r if v V V 2, 35s,11i v I i I TELEGRAPH APPARATUS Franklin J. White, East Orange, and Garvic'e H. Ridings, Summit, N. J assignors to The Western Union Telegraph Company, New York. N. Y., a corporation of New York Application October 1, 1940,-'Serial No. 359,180

6 Claims. (Cl. riv -380) This invention relates to telegraph apparatus" and has particular reference toa code transmitting device and control apparatus therefor.

One object of the-instant invention is to provide means for conditioning a transmitting device for operationand for simultaneously preparing for the subsequent operation of said device.

Anothe'robject of the invention is to provi de, in a spring'driven device, means for winding the spring whereby subsequently said device and/or said winding meansmay be released independently; p I

Still another. object of the invention is to provide an' organization of instrumentalities where-' by the spring of a spring driven device may be manually wound and held in its wound condition for later automatic release and whereby the winding mechanism, after Winding, isheld in a position from which it may be released either manually or automatically independently of the release of said spring driven device.

- A further object of the present inventionis to provide, in a device having two rotatable members each latchable in their operated positions, a linkage engageable to drive one member by the other ,from their unoperated; to their operated positions and thereafter disengageable to permitthe rotatable members to be restored to their unoperated positions independently. 7

, The invention as embodied in'the illustrative form disclosed herein contemplates the use of a code wheel transmitter driven by-a spring m'otor. Means are provided for winding the spring from which the transmitter "motor derives its power and for the latching of the wound spring by a retaining member underthe control of an electromagnet. The winding mechanism which is normallynot connected mechanically to the" motor spring is provided with means for coupling the winding mechanism to the spring for winding purposes only when both the spring and the winding mechanism are in their normalyor' unoperated positions. The winding mechanism is also provided with a yieldable detent which is engageable with an electromagneticallycontrolled latch to retainthemechanism in its operated position. 'When the spring is wound and the trol knob. Also, the winding mechanism may be automaticallyreturn'ed; 01 its unoperated position by energizing the electromagnet'which con trols the latch. Both the spring motor mechanism and the winding mechanism therefor control auxiliary contacts by means of which the latch electromagnets maybe comlitioned for operation and also other contacts whichmay be employed for the controlof the communication apparatus associated withthe control device.

An illustrative embodiment of the invention will be described in conjunction with the accompanying drawings, Qfwhich:

Fig. l is a top orplan view of thetransmitting and control device; i

Fig. 2 is a view taken in elevationof onee'nd of the device; V i I Y V, Fig. 3 is asectional View taken on the line 3--3 of Fig. 2; r

, Figs. 4, 5 and 6 arevieWs taken in elevation of the rear of the device with-- a portion of the rear mounting plate broken away to 'show a portion of the mechanism'illustrate'd in Figf3' and show the winding inechanism-irijvarious operating positions; Y 1

Fig. 7 is a fragmentary View taken Jon line l 1 of Fig. 1 to'show details of the winding control knob; e i

' Fig. 8 is a rear elevational view of the -control device; and I Fig. 9 is a circuit diagram illustrating one system in which the transmittingand-control apparatus embodying the invention may be used.

Having reference first-to Figs, '1, 2 and 3 the mechanical structure of the transmitting/and control device will be described. 'The" apparatus is mounted upon a -supporting structure 'com- A spring driven motor-{I 1 is secured to the rear plate 12 by means of suitable mounting screws. The details of the motor are not shownfherein, since numerous examplesofthis type of motor may be found in the priorart; one of w-hi'cl iis Dmonet; April 27', 193-7. "The-driven shaft *oi the motor 11. is extended-"through theflrear plate: [.2 so :that a code disc-onwheel IB may'be f attached thereto by means o'fa set screwlfl "which is threaded into a hub 20 attached-to the cod e1 wheel. As better illustrated in- Fig. 8, the code flowin the circuit in which the contacts are included. An angular bracket 24 serves to mount the contacts on the outer surface of the rear.

mounting plate l2.

The spring motor I! isprovided with a second shaft 25 which extends from the opposite side of the motor to the driven shaft. The shaft 25 is utilized to wind the spring by which the driven shaft is rotated through-suitable gearing. Rigidly secured tothe winding shaft 25 is an arm 26. In one end of this arm is formed a detent 21 and in the other end is formed a cam surface 28. Also secured rigidly to the extended portion of the winding shaft 25 is a hub or collar 29 which is provided with a tooth 3|.

A winding disc 32 is provided with a shaft 33 (see Fig. 7) which extends through the front mounting plate I3 and is coaxial with but mechanically not connected with the winding shaft 25. A split knob 34 is attached to the outer end of the shaft 33 by a clamping screw 35 which serves to draw the split portions of the knob together and thereby firmly grip the shaft 33. A retaining cup 36 is secured between the knob 34 and the front mounting plate l3 and is employed to house a helical spring 31, the ends of which are extended outwardly from the body of the spring and substantially 'parallel with the axis thereof. One of the ends is inserted in a suitable hole in the knob 34. The purpose of.

this spring is to so urge the knob 34 that it'is always restored to its illustrated unoperated position when released.

Pivoted on the inner surface of the winding disc 32 adjacent the periphery thereof is a detent 38 which is normally urged toward an engagement with a stop pin 39 by means of a retractile spring 4|. Also pivoted on the inner surface of the winding disc 32 is a gravity controlled member 42. This member has formed therein adjacent one end a pawl 43 and is pivoted at a point close to the pawl, thereby providing a substantial amount of metal at the other side of the pivot point from the pawl.

' By reason of the eccentric pivoting of the member 42, it tends to assume a substantially vertical position insofar as it is permitted to do so by the stops and other instrumentalities hereinafter described. As shown in Fig. 3, the member 42 is held in contact with a stop pin 44 by the action of gravity. A substantial portion of the member 42 lies in the same; vertical plane with a. portion of the hub 29 so that the pawl 43 is in a position to engage the tooth 3| upon the .rotation of the winding disc 32 in a counterclockwise direction as viewed in this figure.

.There is also secured to the inner surface of the winding disc 32 adjacent the periphery thereof a contact operating cam 45 which is preferably formed of insulating material. Adjacent the lower extremity of the cam 45, as viewed in Fig.3, .is formed an auxiliary cam surface or lobe 46. Both the elongated portion of the cam 45 and the lobe 46 are adapted to operate contacts in a manner to be described. A substantial portion of the periphery of the winding disc 32 is cut away to form shoulders 41 and 48. As shown in Fig. 3, the shoulder 41 is in engagement with one side of a stop block 49 which is attached to the inside of the front mounting plate [3. The disc 32 is adapted to be rotated in a counterclockwise manner until such movement is arrested by the engagement of the shoulder 48 with the other sideof the stop block 49.

A contact assembly is secured to a mounting block 52 which is attached to the inside of the front mounting plate [3. The contacts comprising this assembly are controlled by an actuating member 53 which terminates at its lower end in a roller. 54. The roller is adapted to be engaged by the elongated portion of the cam 45 when the winding disc 32 is rotated in a counterclockwise manner as viewed in Fig. 3. As shown, the contact assembly 5| is made up of two transfer sets of contacts whereby the levers or 'armatures attached to the actuating member 53 are moved from their engagements with their respective lower contacts to engagements with their respective upper contacts when the cam 45 engages the roller 54.

Another contact assembly 55 is fastened to a mounting-block 56 which is attached to the base II. This assembly comprises three sets of make contacts, one set of which is displaced laterally from the other two, as best illustrated in Fig. 2. The off-set set of contacts is controlled by an actuating member 51 which is adapted to be engaged by the cam lobe 46 when the winding disc 32 is rotated to its operated position. The other two sets of contacts are arranged to be closed by the engagement of an actuating member 58 with the cam surface 28 of the winding shaft arm 26.

Although a specific arrangement of the contacts comprising the assemblies 5| and 55 is illus- ,trated herein for the purpose of describing the invention, it is contemplated that other contact arrangements similarly operated may be used within the scope of the invention without departing from the spirit thereof.

In order to retain the spring of the motor I! in its wound condition a latch 59 is provided. This latch is pivotally mounted upon a pin or red 6| which is' secured to the front mounting plate I3 at a point adjacent the base II. A helical spring 62 is supported by the rod BI and one end thereof is inserted in a hole in the latch 59. The other end of the spring 62 is inserted in a hole in the front mounting plate l3. The function of the spring 62 is to urge the latch 59 toward the right as viewed in Fig. 3. An electromagnet is supported in spaced relation tothe base II by a plurality of rods 64 which are attached to and extend upwardly from the base. The armature 65 of the electromagnet 63 is pivotally secured to the upper end of the latch 59. Normally, with the electromagnet deenergized, the action of the spring 62 effects the engagement of the end of the armature 65 with a portion of the supporting structure ofthe spring motor [Twhich thus acts as a stop. Thus, with the latch 59 in the position shown in Fig. 3, a notch 66 which is provided therein is arranged to engage the detent 21 when the winding shaft arm 26 is rotated counterclockwise, thereby preventing the spring from unwinding.

A second latch 61 is also provided and is pivotally mounted on a rod 68 attached to the front supporting plate l3. A second electromagnet 69 is also mounted atthe upper ends of a plurality of rods 1| attached to the base The armature vI2 of. this electromagnet is pivotally .attached tothelatchG'l and is normally urged by a'retractile spring 13 against a stop pin 14 extending from the inside surface of the front mounting plate l3. The latch 6'! is provided with a hook 15 which is adapted to engage the notched end of the detent 39 so that, when the winding plate 32 has been moved to its operated position, it is held in such position by the latch 61. r

The operation of the control device will be described by having particular reference to Figs. '3, 4, and 6. With the device in its unoperated po sition the mechanism is substantially as illustrated in Fig. 3. When it is desired to wind the spring of the motor I1 and set the code transmitter in condition for operation, the control knob 34 is turned so as to rotate the winding disc 32in a counterclockwise direction as viewed in these figures. During the first stage of the rotation of the winding disc, the tooth 3| of the hub 29 by which the winding shaft 25 is rotated is engaged by the pawl 43. Since the gravity controlled member 42 is already in engagement with the stop pin 44, the continued rotation of the winding disc effects the rotation of the hub 29 and, therefore, the shaft 25. Thus, the winding of themotor spring is initiated. The continued rotation of the winding disc brings the elongated portion of the cam 45 into engagement with the roller 54, thereby transferring the contact levers of the. assembly 5| from their lower to their upper contacts. The next stage of the winding operation brings the cam lobe46 into engagement with the contact actuating member 51, thereby closing the set of contacts of the assembly 55 controlled thereby. The following stage of the winding operation disengages the cam lobe 46 from the actuating member 51 and thereby permits the set of contacts to open again. Substantially at the same time the detent 38 engages the bevelled outer surface of the hook 15 of the latch 61, moving the latch toward the left against the action of the retractile spring 13. When the detent 38 has passed the hook 15, the latch 61 is again restored to the position shown in these figures. The final stage of the Winding operation rotates the detent 2! beyond the notch 66 formed in the latch 59 and brings the shoulder 48 of the winding disc into contact with the stop block 49. Also, the cam surface 28 of the Winding shaft arm 26 engages the actuating member 58 to close the two sets of contacts of the assembly'55 controlled thereby. At this time the gravity controlled member 42 is still kept in contact with the tooth 3|, as illustrated by the broken lines of Fig. 4. As soon as the winding operation is completed, the control knob 34 is released, thereby permitting the winding disc 32 to rotate backward in a clockwise direction under the combined influence of the spring of the motor I! and the helical spring 31 The action of the wound spring of the motor moves the arm 26 also in a clockwise direction until the detent 21 is engaged and held by the notch 66 of the latch 59. Thus, further movement of the arm 26 and the hub 29 is prevented and the contacts controlled by the actuating the actuttting'member 51 to reclose the contacts I controlled thereby. With the winding disc in the position shown inFig. 4, the action of gravity upon the member 42 pivots this member against a stop pin I6. Thus, it is seen that as long as the winding shaft arm 26 is retained in the position illustrated in Fig. 4, it is no longer possible to effect the engagement of the tooth 3| by the pawl 43 for the reason that no matter how the winding disc 32 is thereafter rotated, the member 42 is entirely under the control of gravity, pivoting between the two limits set by the stop pins 44 and 16. After the disengagement of the pawl 43 from the tooth 3|, the detent '38 becomes engaged with the hook I5 of the latch 61. Since the connection 'of the detent 38 with the disc 32 is not a rigid one, the detent is permitted to pivot until a balance has been reached between the restraining action of the spring 4| and the helical spring 31 which'tends to return the winding disc 32 to its unoperated position. The two springs are so arranged that the restraining spring 4| is somewhat the stronger and, therefore, the disc remains latched in its operated position.

Thus, at the completion of the winding and setting operation the apparatus is in the condition illustrated in Fig. 4. It will be observed that the'upper contacts of the assembly 5| are made and allof the contacts of the assembly 55 are closed.

If, after the winding operation has been completed as described, the electromagnet 63 is energized to move its armature 65 toward the left as Viewed in these figures, the latch 59 is withdrawn, therebydisengaging the notch 66 from the detent 21. The winding shaft arm 26 is thus permitted to be restored to its unoperated position by the action of the wound driving spring of the motor Thus, the cam surface 28 of the winding shaft arm 26 becomes disengaged from the actuating member 58, thereby allowing the contacts controlled thereby to open. As the driving spring is being unwound, the driven shaft to which the code wheel I 8 is attached is rotated, thus causing the contacts 23 to be operated in accordance with the notches formed in the periphery of thecode wheel. Thegearing between the winding shaft 25 and the driven shaft to which'the code wheel is attached is such that the code'wheel 'makes a complete revolution while the winding shaft arm 26 is rotated from the position shown in Fig. 4 to that shown in Fig. 3 or Fig. 5. The motor I1 is arranged to stop when it has reached the end of its cycle, leaving the code wheel in the position shown in Fig. 8 and the winding shaft arm 26 in the position shown.

in Fig. 5-. p It will be observed from an inspection of Fig. 5, that the winding disc 3 2,is retained in its operated position, thereby .maintaining the contact levers of the assembly 5| engaged with their upper contacts. Also, the off-set pair of contacts of the assembly 55,.which is controlled by the actuating member 51, is closed while the other two pairs of these contacts are open. The winding disc 32 may be restored to its unoperated position under the influence of the helical spring 31 by energizing the electromagnet 69 and thereby disengaging the latch 61 and the detent 38. The winding disc mechanism is so arranged that after the winding operation has been performed, placing the apparatus in the condition shown in Fig. ,4, the spring of the motor I! may be left in its wound condition and the winding disc 32 returned manually or automatically. to its unoperated position. The automatic release of .thewinding disc is effected by energizing the electromagnet 69 in the manner described. Howe ever,it is also possible to. restore the winding disc 32 to its unoperated position manually by rotating the control knob 34 in the opposite direction to that used for windin purposes. The engagement between the hook of the latch 6'! and the notched end of the detent 38 is a resil-, ient one by reason of the action of the restrainin spring 4|. As previously pointed out, this spring is made somewhat stronger than the helical spring 31 which tends to return the disc to its unoperated position. However, by the application of an additional manual force to the control knob in the direction tending to restore the knob to its normal position, the spring 4| may be overcome, thereby permitting the detent 38 to pivot sufiiciently to disengage itself from the pawl 61. Fig. 6 illustrates the position of. the mechanism after the completion of such an operation. It will be seen that the contacts of the assembly 5| are restored to normal and also that the off-set pair of contacts ofth assembly 55 is open.- However, since the driving spring of the motor I? is still held in its wound condition, the two sets of contacts of the assembly 55 which are controlled by the winding shaft arm 26 remain closed. There is no provision made for the manual release of the spring winding shaft so that, if the operating circuit for the electromagnet 63 includes one of the sets of contacts controlled by the windin shaft'arm 26 and also the off-set pair of contacts controlled by the cam lobe 46, it will not be possible to energize the electromagnet so long as the apparatus is in the position shown in Fig. 6. An inspection of the apparatus as illustrated in Figs, 3, 4, 5 and 6 will disclose that the only time when the operating circuit for the electromagnet 63 would be in condition for operation is when the apparatus is in the condition illustrated in Fig. 4.

The device comprising this invention may be utilized in numerous types ofsystems. One such system is. a telegraph exchange system in which a plurality of stations are connected to a communication channel, each station being provided with transmitting and receiving apparatus and also with facilities for selectively calling any of the other stations included in the system. One manner of employing the device embodying the invention is illustrated in Fig, 9, to which reference will now be made. A pluralityof stations such as A, B and C are connected to a lin circuit L for intercommunication. The circuit details for only station B are shown, it being understood that similar connections. and apparatus are used at the other stations connected to the,

line circuit L. The pertinent parts of the code transmitting and control device ar shown diagrammatically in this figure. For convenience in identifying the various parts of the device, they are given the same numerals of reference as used in the other figures illustrating the mechanical structure of the device. Certain liberties are taken in depicting the control device in this figure, such as the separation of the contacts comprising the assembly 55 and also the relation of the winding shaft arm 26 to thecode wheel Hi. It will be understood that, in view of the foregoing description of the device, thearm 26, in traveling over one-quarter of a revolution in a clockwise direction, will produce a complete revolution of the code wheel I8 me. similar di rection.

The line circuit L, whenidle, is connected through the line equipment of the. various stations to ground-as indicated at station A and station C. This connection is illustrated in detail at station B and comprises a connection from the line circuit'L through the winding of a three-position polar relay 11, the winding of a code selector 18, the right hand break contact of a disconnect key 19, the code transmitting contacts 23 and the left hand normal contact of relay 8| to ground. The three-position polar relay 1'! is of such a character that when the winding is de- 7 energized, as it is with the previously described its upper and lower contacts.

connection, the armature is disengaged from both The selector 18 may be of the type disclosed in Patent 2,029,636, granted to E. M. Rickard on February 4, 1936. Such a selector 'functions only in response to a code individual to itself to close a contact. Each of the station connected to the line circuit L is provided with a similar selector, each of which responds to a different code.

' Each of the communicatin stations is provided with a receiver 82 which, when conditioned as described hereinafter, respond to operations of the line relay 1'! which is actuated by the signals transmitted over the line L. Each of the stations is also provided with a transmitter 83 and a selective code transmitting device, such as the dial 84. Each station may also be provided with a monitor receiver 85 by which the signals transmitted from the transmitter 83, and the dial 84 may be recorded for a home oflice copy, or for another purpose which will be described in a subsequent portion of the specification.

For the operation of the system the detailed portion of the circuit diagram of Fig. 9 will be used to describe the functioning of both the transmitting and the receiving stations. When it is desired to initiate a call at any of the stations, such as the station B, the control knob of the transmitting and control device is operated so as to rotate thewinding'disc 32 counterclockwise as viewed in this figure, thereby winding the spring of the spring motor and eventuating in the engagement of the detent 2'1 with the latch 59'and also of the detent 38 with its associated latch 6'5. The armatures of the contact assembly 5| are moved into engagement with their respective upper contacts. Also, 'the contacts controlled by the actuating members 5'! and 58 are closed. The engagement of the lower armature of the assembly 5| with its upper contact connects the battery 86 to the winding of relay 81, thereby operating this relay. Relay 81 immediately looks from battery 88 through the left hand break contact 01" the disconnect key 19, the contact 39 and the inner make contact of relay 81.

- When it is desired to transmit to another station after the foregoing sequence of operations has been performed, the control knob of the device is'ma'nually restored to its unoperated position, thereby rotating the winding disc 32 .back to the position in which it isshown. The contactspf the assembly 5| are all transferred to their lower contacts, thereby opening the operating circuit of the relay 8?. However, the contacts controlled by the actuating member 58 remain through the dial8 l,'.the transmitter 83 and the monitorreceiver 85 to a positive battery 92. It

is preferable thatthe line circuit be transferred from ground to the described circuit by means of a continuity preserving contact-on the relay 8| sothat there will be nointerruption of the connection to the line circuit while the transfer is .being'made. The operation of relay 8| also supplies power to the transmitter 33 and the monitor receiver '85 through'its right handmake contact from the battery 86.

The connectionof positive battery to the line circuit at station B causes a response by the line relays connected to the line L at all of the stations. The armatures of these-relays move into "engagement withtheir respective lower contacts but produce no results at this time, "since the connection through the armatures is open at the upper contact associated with the lower armatures of the assembly 5| at all of the stations. The attendant, at the calling station then perates the dial 84 in accordance with the code assigned to the station which is being called. The selectors 18 at all of the stations are subjected to the signalsxtransmitted from the dial '84. However, only one of the selectors will be operated in respon'se'to the transmitted code to close its contacts. 7

Assume now that the apparatus showniin Fig. 9 is located at the called station. The closure of the contacts of the selector 18 connects the battery 86 through the lower contact associated with the lower armature of the assembly tothe winding of relay 93 which immediately locks up through its left hand make contact. .The battery 86 is also connected through the right hand make contact of relay 93 to a signal lamp 94. The attendant at thecalled station, inresponse to the operation of the signal lamp 94, turns the control knob of the transmitting and control device to its operated position and leaves it in such a position. The disengagement of the lower armature of the assembly' 5| from its lower contact opens the locking circuitorf the relay, 93,

thereby releasing this relay and'extin'guishing the lamp-'94. The engagementof the lower armature of the assembly 6! with its upper contact connects the battery 86 to supply power to the receiver 82 and also operates relay 8? as at the calling station. V p

Associated with the receiver 82 is a delayed action contact 95 which does not close as soon as the power is connected to the receiver. Such a contact may be controlled by a slow-to-operate relay, by a vacuum tuloe which requires some time for the heating-of its cathode orrby any other well-known time delay device. As soon as the contact 95 does close, however, the winding of relay 95 is energized through an obvious circuit.

to apply a ground through its make contact and through the con-tact 9? controlled by the wind ing shaft arm 29, through the winding of the electromagnet' 63, the make contact controlled by the actuating member 5'! and the upper contact associated with the lower armature of the assembly 5! to battery 86. The electromaghet 6-3 thus becomes energized to withdraw the latch 59, thereby permitting the winding-shaft arin 26 to return to the position whichit is shown and "to rotate the code wheeldisc l-8-through one comple'terevolution. The line circuit which terminates in'ground at this station at the left hand normal contact of relay "8 l is thus interrupted by the contacts 23 in accordance with the notches cut in the periphery of the code wheel 18. The answer-back code which is'thus transmitted. over the line circuit L is received at the calling station by the monitor receiver 85. Since this receiver has previously recorded the called station's code as transmittedby thedial 84, comparison between the transmitted code and the answer-back code of the selected station may be obtained. Thus, the 'attendantiatthe 'calling'station will have before him evidence that he is now connected with the station which he has called.

' erated momentarily.

At the called station the release of the windingshaft arm 26 opens the'conta'cts 89 and 91, thereby opening the locking circuit for relay 81 and opening the operating circuit for the electromagnet 63. The relay 8! remains operated, however, since its operating circuit is still intact through the contacts of the assembly 5l Also, at the called station the battery86 'is'conn'ected to the armature of the line relay 11 through the lower armature and associated upper contact of the assembly 5|. The lower'contactof this re=- lay is connected throughthe' signal "responsive apparatus of the receiver 82 and through the upper contact associated with the upper armature of the assembly 5| to' ground. Therefore, after the answer-back code-has beensent over the line L from the called station, there is 'a-complete circuit from the positiv'e'battery 92'a't the calling statio'nto the ground of the le'ft'hand contact of relay 8| at the called station. The

positive potential thus'applied to the line relay 111 at the called station effects the engagementiof the armature of thisrelay withits lower contact. Hence, there is a complete circuit'from the battery 86 through the low'er contact of the line relay" and the receiver 82 to ground.

The transmitter 83 at "the calling station is operated to send the intelligence conveying signals over the line L by opening and closing the line circuit. These make and break signals, when received at the called station, open and close the circuit of the receiver 82 by the action of the contacts of line relay 11. Thus, the signals which are transmitted from the calling station transmitter are received at thecalled stationreceiverJ 7 Following the transmission of the message from the calling station, the disconnect key 19 is op- The opening of theleft handbr'eak contact of this key interrupts'the locking circuit of relay 81, thereby releasing this relay. At the same time the line is disconnected by the right hand break contact of the disconnect key from the contacts of relay 8| and is connected by the right hand makecontact of the disconnect key to negative battery'98." The release of relay 81 opens the operating circuitof thezrelay 8| whichtransfers the line connection from the positive battery 92 to ground in which'the line will terminate as soon as the disconnect key is released.

The connection of negative battery to the line circuit at the calling station produces a response by the line relay 11 at thecalled station',resulting inthe engagement of the armature of this relay with its upper contact. A circuit isthen completed from the battery 86" through the upper contact associated with the lower armature to withdraw the latch 61 and to permit the winding-disc 32 tobe restored to the position in which it is shown. The upper contacts of the assembly 2 5| are thus broken, and the lower contacts remade, thereby disconnecting the battery 86 from -69 is deenergized. Thus, it will be observed that the control .apparatus at the called station is restored to normal in response to the. negative potential which is momentarily applied to the line circuit L. i

Also, it is seen at the calling station that the operation of the disconnect key 19 restores all of the control apparatus at this station to nor.

mal. -Howev'er, it. will be seen'that the spring motorQisleft incondition for operation, but is incapable thereof since the operating circuit for the release electromagnet 63 is open at several points, particularly at the contact controlled by .the actuating member. 51; When the key is released, the line circuit connection is transferred from the negative potential of battery'98 to the ground connected to the contacts of relay 8|.

The nature of the invention may be ascertained from the foregoing description of an illustrative embodiment, itbeing understood that changes in theinvention" herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention.

What is claimed is? 1. Telegraph apparatus comprising a code wheel transmitter and a spring actuated driving motor therefor, winding means for said spring provided with a detainable member, detaining .means engageable with said detainable member in the spring-wound position of said winding means, windingmechanism including .an actuating member arranged for movement. between two positions and provided with a second detainable member, a; second detaining means engageable with said seconddetainable member in one positionofsaidactuating member, a pawl controlled in part by said actuating member, means includins said pawl for operating said winding means, and meansfor disengaging both ofsaid detaining means ,from both of said detainable members independently,

2. Telegraph apparatus comprising a code wheel transmitter anda spring actuated driving motor therefor, awinding shaft for said spring having a latchable detent secured thereto, a first latch engageable with said winding shaft detent in the-spring wound position of said winding shaft, winding mechanism including a'rotatable member arranged for rotation between unoperated and operated positions, a latchable detent carried by said rotatable member, a second latch engageable with said last mentioned detent in the operated position of said rotatable member, a gravity controlled pawl carried by said rotatable member, meansincluding said pawl for rotating said winding shaft, and means for releasing said detents independently. I

3. Telegraph apparatus comprising a code wheel transmitter and a spring actuated driving motor thereforja winding shaft for said spring having a latchable detent secured thereto, a first electromagnetically controlled latch 'engageable with said windingshaft detent in the spring relay 1! and the winding ofthe electromagnet -69 to ground. 'This electromagnet is energized an actuating knob therefor, said member being arranged for rotation between unoperated and operated positions, a latchable detent carried by said rotatable member, a second electromagnetically controlled latch engageable with said last mentioned detent in the operated position of said rotatable member, a gravity controlled pawl carried by said rotatable member, means including said pawl for rotating'said winding shaft, and circuit control means for withdrawing either or both of said latches.

4. Telegraph apparatus comprising a code wheel transmitter and a spring actuated driving motor therefor, means for winding said spring, said winding means being provided with a latchable detent and a toothed operating member, a transmitter release latch adapted to engage said latachable detent in the wound position of said winding means, means operable for actuating said winding means, said actuating means being provided with a yieldable detent and a pawl normally arranged to pivot under the action of gravity and being disposed to engage saiad toothed operating memberonly in the unwound position of said winding means, a release latch for said actuating means arrangedto engage said yieldable detent after operation of said actuating means, the latching of said winding means and said actuating means permitting the pivoting of said pawl out of engagement with said toothed operating member, the yieldable detent permitting the manual restoration of the actuating means to its unoperated position independently of the latched winding means and of the release latch for, said actuating means, and means controlled jointly by said winding means and said actuating means'to condition said transmitter release latch for release., v

5. Telegraph apparatus comprising a code wheel transmitter and a spring actuated driving motor therefor, a winding shaft for said spring having a latchable detent and a toothed member secured thereto, a transmitter release latch and a controlelectromagnettherefor, said transmitter release latch being adapted to engage said winding shaft detent in the spring wound position of said shaft, a winding disc having an actuating knob operable between unoperated and operated positions, said disc being provided with a pawl normally arranged topivot between two limiting positions under the action of gravity, said pawl ei sposed to engage said toothed member in the unoperated position of the disc and to rotate the winding shaft by operation of said disc from its unoperated to its operated position, a yieldable detent attached to said winding disc, a disc release latch and a control electromagnet therefor, said disc release latch being arranged to engage said yieldable detent in the operated position of said disc, the latching of said wind ing shaft and said winding disc permitting the pivoting of the gravity controlled pawl out of engagement with said toothed-member, the yieldable detent permitting the manual restoration of the winding disc to its unoperated position independently of the latched winding shaft and of the having a latchable detent and a toothed member secured thereto, a transmitter release latch and a control electromagnet therefor, said transmitter release latch being adapted to engage said winding shaft detent in the spring wound position'of said shaft, a winding disc having an actuating knob operable between unoperated and operated positions, said disc being provided with a pawl normally arranged to pivot between two limiting positions under the action of gravity, said pawl being disposed to engage said toothed member in the unoperated position of the disc and to rotate the winding shaft by operation of said disc from its unoperated to its operated position, a yieldable detent attached to said winding disc, a disc release latch and a control electromagnet therefor, said disc release latch being arranged to engage said yieldable detent in the operated position of said disc, the latching of said winding shaft and said winding disc permitting the pivoting of the gravity controlled pawl out of engagement with saidtoothed memher, the yieldable detent permitting the manual restoration of the winding disc to its unoperated 

